<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			.bg{
				background-color: #007ACC;
			}
		</style>
	</head>
	<body>
		<div class="bg">
			背景颜色
		</div>
	</body>
</html>
